Add the fish first, and if their ok for a month, then add the turtles. If the fish all die off, then redesign your set up. I'm not aware of roofing rubber, but I'd stick with the products that are made for their original purpose (stick with pond products for ponds, and roof product for roofs.)

:Hey All,

:Well a few of you have been a huge help in my planning of my new spotted turtle pond/possible blandings turtle as well in time. I figured I would make a new post since my other has become quite long with many questions of mine being answered.

:Now for from what I gather as a very contriversal issue. What to use as my liner. I know it has to be a 45 mil rubber liner but can I use roofing liner or does it have to be a guarentted pond safe liner?

:I was looking at skippy's pond page and he said roofing liner is fine. Now I want a few other peoples input on this.

:I will have fish...feeder goldfish for the turtles and lots of plants of course. Also after i fill my pond for the first time...after washing off the liner...how long before I can add turtles/fish/plants?